#include <stdio.h>

int calculerLongueur(char* src) {
  int cpt = 0;
  char* s = src;
  while (*s != 0x00) {
    cpt++;
    s++;
  }
  return cpt;
}

void copier(char* src, char* dst) {
  char* dt = dst;
  char* s = src;
  while (*s != 0x00) {
    *dt = *s;
    s++;
    dt++;
  }
  *dt = 0x00;
}

void concatener(char* src1, char* src2, char* dst) {
  char* dt = dst;
  char* s = src1;
  while (*s != 0x00) {
    *dt = *s;
    s++;
    dt++;
  }
  s = src2;
  while (*s != 0x00) {
    *dt = *s;
    s++;
    dt++;
  }
  *dt = 0x00;
}

void inserer(char* src, int p, char* dst) {
  int ldst = calculerLongueur(dst);
  if ((p < 0) || (p > ldst)) {
    return;
  }
  int lsrc = calculerLongueur(src);
  char* d1 = &dst[ldst + lsrc];
  char* d2 = &dst[ldst];
  printf("%d %d %d\n", ldst, lsrc, ldst - p + 1);
  for (int i = 0; i < ldst - p + 1; i++) {
    *d1 = *d2;
    d1--;
    d2--;
  }
  d2 = &src[lsrc - 1];
  for (int i = 0; i < lsrc; i++) {
    *d1 = *d2;
    d1--;
    d2--;
  }
}

void supprimer(char c, char* src) {
  char* d = src;
  char* s = src;
  while (*s != 0x00) {
    if (*s != c) {
      *d = *s;
      d++;
    }
    s++;
  }
  *d = 0x00;
}

void tester1(void) {
  char str[50];
  char* s1 = "abcdef";
  char* s2 = "xyz";
  concatener(s1, s2, str);
  printf("\"%s\" + \"%s\" : \"%s\"\n", s1, s2, str);
  printf("\n");
}

void tester2(void) {
  char str[50];
  char* s1 = "0123456789";
  char* s2 = "xyz";
  int pos = 5;
  copier(s1, str);
  inserer(s2, pos, str);
  printf("\"%s\", %d, \"%s\" : \"%s\"\n", s1, pos, s2, str);
  printf("\n");
}

void tester3(void) {
  char str[50];
  char* s = "xyxzxxxyyyzxxzzzyxzyxzyxxx";
  char car = 'x';
  copier(s, str);
  printf("\"%s\", ", str);
  supprimer(car, str);
  printf(" %c : \"%s\"\n", car, str);
  car = 'y';
  printf("\"%s\", ", str);
  supprimer(car, str);
  printf(" %c : \"%s\"\n", car, str);
  car = 'z';
  printf("\"%s\", ", str);
  supprimer(car, str);
  printf(" %c : \"%s\"\n", car, str);
  printf("\n");
}

int main(void) {
  tester1();
  tester2();
  tester3();
  return 0;
}